<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="./css/index.css">
    <script src="./js/jquery-1.12.4.js"></script>
    <script src="./js/index.js"></script>

</head>
<body>
    <div class="big">
        <h3>开心一笑</h3>
        <button>点我</button>
        <div class="small"></div>
    </div>
</body>
</html>